Patents by Inventor Kohei Hasegawa

Kohei Hasegawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11451738
    Abstract: A recording apparatus configured to access a recording medium includes a controller that sets a temperature threshold value for execution of function limitation on the recording medium to the recording medium, wherein, based on an operation state of the recording apparatus, the controller selects whether to execute a first setting to set the temperature threshold value to a specific value or a second setting to set the temperature threshold value to a value greater than the specific value.
    Type: Grant
    Filed: November 24, 2020
    Date of Patent: September 20, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kohei Katsumata, Takashi Hasegawa
  • Patent number: 11435109
    Abstract: A ventilator includes a heat exchanger including a plurality of layered partition members, and a housing that has a first end wall part covering one end side of the heat exchanger along a layering direction and a second end wall part covering the other end side of the heat exchanger, and partitions a periphery of the heat exchanger into an exhaust air flow inlet space, an exhaust air flow outlet space, a supply air flow inlet space, and a supply air flow outlet space. An exhaust air flow passes through the exhaust air flow outlet space during heat exchange ventilation, and passes through the supply air flow inlet space during normal ventilation. A supply air flow passes through the supply air flow inlet space during heat exchange ventilation, and passes through the exhaust air flow outlet space during normal ventilation.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: September 6, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kohei Hasegawa, Hajime Takashima
  • Publication number: 20220258543
    Abstract: A pneumatic tire that has land portions formed by being partitioned by circumferential grooves and widthwise fine grooves formed therein so as to extend in a tire widthwise direction. The widthwise fine grooves have widened groove portions at a groove bottom thereof with an increased groove width. When the tire is worn to a depth of 50% of a depth from a treading face of an unused tire to an end face of a tread wear indicator, an outer side land portion cross sectional area ratio of the outer side land portion on the outer side in the tire widthwise direction is higher than an inner side land portion cross sectional area ratio of the inner side land portion on the side of a tire equator line. Thus, the pneumatic tire can suppress uneven wear from the middle stage of wear while a desirable wet grip performance is constantly maintained.
    Type: Application
    Filed: June 11, 2020
    Publication date: August 18, 2022
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Kohei HASEGAWA
  • Publication number: 20220242173
    Abstract: A pneumatic tire wherein land portions are formed by being partitioned by circumferential grooves and widthwise fine grooves are formed thereon and extend in a tire widthwise direction, the widthwise fine grooves have a widened groove portion of an increased groove width on a groove bottom thereof, and when the tire is worn to a depth of 50% of a depth from a tread treading face of an unused tire to an end face of a tread wear indicator, an inner side land portion cross sectional area ratio of the inner side land portion on a tire equator line side is higher than an outer side land portion cross sectional area ratio of the outer side land portion on the outer side in the tire widthwise direction. Thus, the pneumatic tire can suppress uneven wear after the middle stage of wear while a wet grip performance is normally kept good.
    Type: Application
    Filed: June 11, 2020
    Publication date: August 4, 2022
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Kohei HASEGAWA
  • Publication number: 20220131519
    Abstract: A piezoelectric vibrating device according to the present invention is provided with: a piezoelectric vibration plate having first and second driving electrodes respectively formed on main surfaces on both sides thereof, the piezoelectric vibration plate further having first and second mounting terminals that are respectively connected to the first and second driving electrodes. The piezoelectric vibrating device is also provided with first and second sealing members respectively joined to the main surfaces on both sides of the piezoelectric vibration plate in a manner that the first and second driving electrodes of the piezoelectric vibration plate are covered with these sealing members. At least one of the first and second sealing members includes a film made of a resin.
    Type: Application
    Filed: January 16, 2020
    Publication date: April 28, 2022
    Inventors: Manabu OHNISHI, Koji NAKAMURA, Takuya KOJO, Kohei HASEGAWA
  • Patent number: 10941471
    Abstract: Provided are a high-strength steel sheet having a specified chemical composition, in which a Mn-segregation degree in a region within 100 ?m from a surface thereof in a thickness direction is 1.5 or less, in a plane parallel to the surface of the steel sheet in a region within 100 ?m from the surface of the steel sheet in the thickness direction, the number of oxide-based inclusion grains having a grain long diameter of 5 ?m or more is 1000 or less/100 mm2, a proportion of the number of oxide-based inclusion grains having a chemical composition containing alumina of 50 mass % or more, silica of 20 mass % or less, and calcia of 40 mass % or less to the total number of oxide-based inclusions having a grain long diameter of 5 ?m or more is 80% or more, a specified metallographic structure, and a TS of 980 MPa or more, a high-strength galvanized steel sheet, and a manufacturing method thereof.
    Type: Grant
    Filed: December 26, 2016
    Date of Patent: March 9, 2021
    Assignee: JFE Steel Corporation
    Inventors: Kenji Kawamura, Yoshihiko Ono, Nobusuke Kariya, Shinichi Furuya, Kohei Hasegawa
  • Patent number: 10590504
    Abstract: A high-strength cold-rolled steel sheet having a specified chemical composition and a microstructure including ferrite having an average crystal grain diameter of 2 ?m or less in an amount of 10% to 25% in terms of volume fraction, retained austenite in an amount of 5% to 20% in terms of volume fraction, martensite having an average crystal grain diameter of 2 ?m or less in an amount of 5% to 15% in terms of volume fraction, and the balance being a multi-phase structure including bainite and tempered martensite having an average crystal grain diameter of 5 ?m or less, in which a relational expression, 0.35?V2/V1?0.75 (1), is satisfied, where V1 is a volume fraction of phases which are different from ferrite and V2 is a volume fraction of tempered martensite.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: March 17, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Katsutoshi Takashima, Kohei Hasegawa, Yoshimasa Funakawa
  • Publication number: 20190368769
    Abstract: A ventilator includes a heat exchanger including a plurality of layered partition members, and a housing that has a first end wall part covering one end side of the heat exchanger along a layering direction and a second end wall part covering the other end side of the heat exchanger, and partitions a periphery of the heat exchanger into an exhaust air flow inlet space, an exhaust air flow outlet space, a supply air flow inlet space, and a supply air flow outlet space. An exhaust air flow passes through the exhaust air flow outlet space during heat exchange ventilation, and passes through the supply air flow inlet space during normal ventilation. A supply air flow passes through the supply air flow inlet space during heat exchange ventilation, and passes through the exhaust air flow outlet space during normal ventilation.
    Type: Application
    Filed: March 24, 2017
    Publication date: December 5, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kohei HASEGAWA, Hajime TAKASHIMA
  • Patent number: 10435762
    Abstract: A high-strength cold-rolled steel sheet has a composite structure containing 0.15 to 0.25% by mass of C, 1.8 to 3.0% by mass of Mn, and 0.0003 to 0.0050% by mass of B, and having a ferrite volume fraction of 20% to 50%, a retained austenite volume fraction of 7% to 20%, a martensite volume fraction of 1% to 8%, and the balance containing bainite and tempered martensite, and in the composite structure, ferrite has an average crystal grain diameter of 5 ?m or less, retained austenite has an average crystal grain diameter of 0.3 to 2.0 ?m and an aspect ratio of 4 or more, martensite has an average crystal grain diameter of 2 ?m or less, a metal phase containing both bainite and tempered martensite has an average crystal grain diameter of 7 ?m or less, the ratio of the volume fraction of tempered martensite to the volume fraction of a metal structure other than ferrite is 0.60 to 0.85, and the average C concentration in retained austenite is 0.65% by mass or more.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: October 8, 2019
    Assignee: JFE Steel Corporation
    Inventors: Katsutoshi Takashima, Yoshihiko Ono, Kohei Hasegawa
  • Patent number: 10329636
    Abstract: A high-strength cold-rolled steel sheet having good ductility, hole expandability, and delayed fracture resistance and being excellent in material homogeneity. The steel sheet has a chemical composition containing, in mass %, C: 0.15 to 0.25%, Si: 1.2 to 2.2%, Mn: 1.7 to 2.5%, P: 0.05% or less, S: 0.005% or less, Al: 0.01 to 0.10%, N: 0.006% or less, Ti: 0.003 to 0.030%, B: 0.0002 to 0.0050%, and Fe and inevitable impurities. The steel sheet has a microstructure that includes ferrite having an average crystal grain diameter of 4 ?m or less at a volume fraction of 5 to 20%, retained austenite at a volume fraction of 5% or less, including 0%, and tempered martensite at a volume fraction of 80 to 95%. Additionally, the mean free path of the ferrite is 3.0 to 7.5 ?m.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: June 25, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Katsutoshi Takashima, Kohei Hasegawa
  • Patent number: 10253389
    Abstract: A high-yield-ratio, high-strength cold-rolled steel sheet has a composition containing, in terms of % by mass, C: 0.13% to 0.25%, Si: 1.2% to 2.2%, Mn: 2.0% to 3.2%, P: 0.08% or less, S: 0.005% or less, Al: 0.01% to 0.08%, N: 0.008% or less, Ti: 0.055% to 0.130%, and the balance being Fe and unavoidable impurities. The steel sheet has a microstructure that contains 2% to 15% of ferrite having an average crystal grain diameter of 2 ?m or less in terms of volume fraction, 5 to 20% of retained austenite having an average crystal grain diameter of 0.3 to 2.0 ?m in terms of volume fraction, 10% or less (including 0%) of martensite having an average grain diameter of 2 ?m or less in terms of volume fraction, and the balance being bainite and tempered martensite, and the bainite and the tempered martensite having an average crystal grain diameter of 5 ?m or less.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: April 9, 2019
    Assignee: JFE Steel Corporation
    Inventors: Katsutoshi Takashima, Kohei Hasegawa
  • Patent number: 10196727
    Abstract: A method of manufacturing a galvanized steel sheet includes a two-stage temperature raising process which includes: primary heating the sheet from 200° C. to an intermediate temperature of 500 to 800° C. at a primary average heating rate of 5 to 50° C./second at an excess air ratio of 1.10 to 1.20 maintained up to the intermediate temperature; secondary heating the sheet from the intermediate temperature to an annealing temperature of 730 to 900° C. at a secondary average heating rate of 0.1 to 10° C./second at an excess air ratio of less than 1.10 maintained up to the annealing temperature; holding the sheet to the annealing temperature for 10 to 500 seconds; cooling the sheet to 450 to 550° C. at an average cooling rate of 1 to 30° C./second; and subjecting the sheet to a galvanizing process and, optionally, an alloying process.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: February 5, 2019
    Assignee: JFE Steel Corporation
    Inventors: Shusaku Takagi, Kohei Hasegawa
  • Publication number: 20190017156
    Abstract: Provided are a high-strength steel sheet having a specified chemical composition, in which a Mn-segregation degree in a region within 100 ?m from a surface thereof in a thickness direction is 1.5 or less, in a plane parallel to the surface of the steel sheet in a region within 100 ?m from the surface of the steel sheet in the thickness direction, the number of oxide-based inclusion grains having a grain long diameter of 5 ?m or more is 1000 or less/100 mm2, a proportion of the number of oxide-based inclusion grains having a chemical composition containing alumina of 50 mass % or more, silica of 20 mass % or less, and calcia of 40 mass % or less to the total number of oxide-based inclusions having a grain long diameter of 5 ?m or more is 80% or more, a specified metallographic structure, and a TS of 980 MPa or more, a high-strength galvanized steel sheet, and a manufacturing method thereof.
    Type: Application
    Filed: December 26, 2016
    Publication date: January 17, 2019
    Applicant: JFE Steel Corporation
    Inventors: Kenji Kawamura, Yoshihiko Ono, Nobusuke Kariya, Shinichi Furuya, Kohei Hasegawa
  • Patent number: 10174396
    Abstract: A high-strength cold-rolled steel sheet has a chemical composition containing, by mass %, C: 0.15% or more and 0.30% or less, Si: 0.8% or more and 2.4% or less, Mn: 2.4% or more and 3.5% or less, P: 0.08% or less, S: 0.005% or less, Al: 0.01% or more and 0.08% or less, N: 0.010% or less, Ti: 0.002% or more and 0.05% or less, B: 0.0002% or more and 0.0050% or less, and the balance being Fe and inevitable impurities, a microstructure including ferrite having an average grain diameter of 3 ?m or less and a volume fraction of 5% or less (including 0%), retained austenite having a volume fraction of 10% or more and 20% or less, martensite having an average grain diameter of 4 atm or less and a volume fraction of 20% or less (including 0%), and the balance including bainite and/or tempered martensite.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: January 8, 2019
    Assignee: JFE Steel Corporation
    Inventors: Katsutoshi Takashima, Yuki Toji, Kohei Hasegawa
  • Patent number: 10156005
    Abstract: A steel sheet includes a microstructure containing a volume fraction of 20% to 55% of ferrite having an average grain size of 7 ?m or less, a volume fraction of 5% to 15% of retained austenite, a volume fraction of 0.5% to 7% of martensite having an average grain size of 4 ?m or less, and a structure composed of bainite and/or tempered martensite and having an average grain size of 6 ?m or less, and a difference in nano-hardness between ferrite and the structure composed of bainite and/or tempered martensite being 3.5 GPa or less and a difference in nano-hardness between the structure composed of bainite and/or tempered martensite and martensite being 2.5 GPa or less.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: December 18, 2018
    Assignee: JFE Steel Corporation
    Inventors: Katsutoshi Takashima, Yoshihiko Ono, Kohei Hasegawa
  • Patent number: 10144996
    Abstract: A high strength cold rolled steel sheet with a low yield ratio has a chemical composition containing C: 0.05% to 0.10%, Si: 0.6% to 1.3%, Mn: 1.4% to 2.2%, P: 0.08% or less, S: 0.010% or less, Al: 0.01% to 0.08%, N: 0.010% or less, and the remainder being Fe and incidental impurities, on a percent by mass basis, and a microstructure in which the average grain size of ferrite is 15 ?m or less, the volume fraction of ferrite is 70% or more, the volume fraction of bainite is 3% or more, the volume fraction of retained austenite is 4% to 7%, the average grain size of martensite is 5 ?m or less, and the volume fraction of martensite is 1% to 6%, wherein the average C concentration (percent by mass) in the retained austenite is 0.30% to 0.70%, yield ratio is 64% or less, and the tensile strength is 590 MPa or more.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: December 4, 2018
    Assignee: JFE Steel Corporation
    Inventors: Katsutoshi Takashima, Yuki Toji, Hideyuki Kimura, Kohei Hasegawa
  • Patent number: 10094587
    Abstract: A heat-exchange ventilation device includes: a heater connection terminal to which an external connection heater is connected; a temperature sensor that measures a temperature of a supply air flow passing through an air supply passage; and a control unit that controls operations of an air supply fan and an air exhaust fan and turning-on and turning-off of the external connection heater based on a measurement result of the temperature sensor. The external connection heater is installed in an outdoor air-supply duct and heats a supply air flow flowing through the air supply passage into a heat exchanger. The air supply fan is operable at a plurality of intensities, and the control unit prohibits a state in which the air supply fan is operated at an intensity lower than an intensity set in advance and the external connection heater is turned on.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: October 9, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kohei Hasegawa, Kohei Matsumoto, Masashi Ashino, Fumio Saito
  • Patent number: 10090753
    Abstract: A power conversion device includes: a first power conversion circuit that converts power inputted from outside and outputs the converted power to a second power conversion circuit connected to the first power conversion circuit via a DC link, which outputs the converted power to a load; smoothing capacitors provided in an output part of the first power conversion circuit and an input part of the second power conversion circuit; a first and second common mode current extraction circuits provided in an input part of the first power conversion and second power conversion circuits; and a virtual neutral potential line that connects the first and second common mode current extraction circuits; a DC link filter circuit that includes a Y-shaped capacitor connected between the DC link part and the virtual neutral potential line.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: October 2, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kohei Hasegawa, Sari Maekawa, Takenori Yasuzumi, Atsuhiko Kuzumaki
  • Publication number: 20180278141
    Abstract: A power conversion device includes: a first power conversion circuit that converts power inputted from outside and outputs the converted power to a second power conversion circuit connected to the first power conversion circuit via a DC link, which outputs the converted power to a load; smoothing capacitors provided in an output part of the first power conversion circuit and an input part of the second power conversion circuit; a first and second common mode current extraction circuits provided in an input part of the first power conversion and second power conversion circuits; and a virtual neutral potential line that connects the first and second common mode current extraction circuits; a DC link filter circuit that includes a Y-shaped capacitor connected between the DC link part and the virtual neutral potential line.
    Type: Application
    Filed: March 20, 2018
    Publication date: September 27, 2018
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kohei Hasegawa, Sari Maekawa, Takenori Yasuzumi, Atsuhiko Kuzumaki
  • Patent number: 10084442
    Abstract: A semiconductor device according to an embodiment includes a normally-off transistor having a first source, a first drain, and a first gate; a normally-on transistor having a second source electrically connected to the first drain, a second drain, and a second gate, a capacitor having a first end and a second end, the second end being electrically connected to the second gate, a first diode having a first anode electrically connected between the second end and the second gate and having a first cathode electrically connected to the second source, a first resistor provided between the first end and the first gate, and a second diode having a second anode electrically connected to the first end and having a second cathode electrically connected to the first gate, the second diode being provided in parallel with the first resistor.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: September 25, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kentaro Ikeda, Takenori Yasuzumi, Kohei Hasegawa